When I first started reading this thread I was hoping that it would be good for an online shop I am thinking about, $90 sounds cheap compared to the pay monthly e-commerce solutions like Shopify.
I tried the demo and was impressed by the way it can re-calculate the currency for items, but then it all became a bit confusing, and now I have mixed feelings about it.
Even if the finished item were $200 and $50 annual maintenance fee, it would still work out cheaper than Spotify, I'm jus tnot sure it will look how I want it to as a stand alone online shop.